Prpogation Mechanism of Microcracks Caused by Corrosion of Laser Cladded In625 Coating on Nodular Cast Iron in 3.5%NaCl Solution

doi:10.11902/1005.4537.2023.231

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 645-657 DOI: 10.11902/1005.4537.2023.231

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Prpogation Mechanism of Microcracks Caused by Corrosion of Laser Cladded In625 Coating on Nodular Cast Iron in 3.5%NaCl Solution

DENG Shuangjiu, LI Chang(

), YU Menghui, HAN Xing

School of Mechanical Engineering and Automation, University of Science and Technology of Liaoning, Anshan 114051, China

Cite this article:

DENG Shuangjiu, LI Chang, YU Menghui, HAN Xing. Prpogation Mechanism of Microcracks Caused by Corrosion of Laser Cladded In625 Coating on Nodular Cast Iron in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 645-657.

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Abstract

IN625 coating was laser clad on the surface of QT600 nodular cast iron, and the microstructure and composition of the clad coating were characterized by means of optical microscope and scanning electron microscope with energy dispersive spectroscope. The electrochemical corrosion behavior of the IN625 clad QT600 nodular cast iron was examined in 3.5%NaCl solution. Meanwhile, a numerical model of the transient evolution of micro-crack growth induced by corrosion of IN625 laser cladding layer was established, considering the corrosion process induced by the existence of micro-cracks in the cladding layer working in a harsh environment. The transient evolution of ion concentration, ion migration, pH value, electrode potential and corrosion rate during corrosion were analyzed. The results show that the corrosion resistance of IN625 clad QT600 nodular cast iron is significantly superior to that of the bare QT600 nodular cast iron.

Key words: laser cladding technology IN625 cladding layer microcracking corrosion electrochemical experiment

Received: 26 July 2023 32134.14.1005.4537.2023.231

ZTFLH:

TG171

Fund: Applied Basic Research Project of Liaoning Province(2023JH2/101300226)

Corresponding Authors: LI Chang, E-mail: lichang2323-23@163.com

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	DENG Shuangjiu
	LI Chang
	YU Menghui
	HAN Xing

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.231 OR https://www.jcscp.org/EN/Y2024/V44/I3/645

Fig.1 Microscopic cracks on the surface of the cladding layer

Fig.2 Morphologies of QT600 nodular cast iron (a) and IN625 alloy powders (b)

Table 1 Elemental compositions of QT600 nodular cast iron and IN625 alloy powder

Fig.3 Principle diagram of laser cladding technology

Fig.4 Cross-sectional morphology of IN625 cladding layer (a) and depth profiles of alloying elements (b)

Fig.5 Polarization curve fitting of QT600 substrate (a) and IN625 cladding layer (b)

Fig.6 Schematic diagram of micro-crack corrosion of IN625 cladding layer

Fig.7 Schematic diagram of microscopic cube

Fig.8 Meshing of corrosion induced expansion of the microcrack in IN625 cladding layer

Fig.9 Variations of Poisson's ratio (a), specific heat capacity (b), density (c), thermal conductivity (d), Young's modulus (e) and coefficient of thermal expansion (f) of IN625 cladding layer with temperature

Fig.10 pH change cloud maps of microcrack in IN625 cladding layer after corrosion for 0 d (a), 20 d (b), 40 d (c), 60 d (d), 80 d (e) and 100 d (f)

Fig.11 Data extraction lines at different locations

Fig.12 Variations of pH value at different locations of microcrack during corrosion: (a) center line position, (b) edge line position

Fig.13 Variations of electrode potential at different locations of microcrack during corrosion: (a) center line position, (b) edge line position

Fig.14 Crack growth rates at different locations of microcrack during corrosion: (a) center line position, (b) edge line position

Fig.15 Crack depths at different locations of microcrack during corrosion

Fig.16 Changes of Ni²⁺ concentration during corrosion for 0-100 d: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

Fig.17 Changes of Na⁺ concentration during corrosion for 0-100 d: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

Fig.18 Changes of Cl^- concentration during corrosion for 0-100 d: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

Fig.19 Variations of Ni²⁺ (a, b), Na⁺ (c, d), and Cl^- (e, f) concentrations with time at the center line position (a, c, e) and edge line position (b, d, f) of the microcrack

Fig.20 Analysis results of Ni²⁺ migration trajectory: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

Fig.21 Analysis results of Na⁺ migration trajectory: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

Fig.22 Analysis results of Cl^- migration trajectory: (a) 0 d, (b) 20 d, (c) 40 d, (d) 60 d, (e) 80 d, (f) 100 d

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